Telephone receiver



July 29 1924. 1503,243

O. M. LEI CH v TELEPHONE RECEIVER Filed June 2, 1922 v NON-MAGNETICMA-TAL Alon-Man Erlc MET/IL sed/"M Zez'c/z,

- uNrr OSCAR M. LEIGH, OF GENOA, ILLINOIS, ASSIGNOR T LEIGH ELECTRIC00., OF GENOA, ILLINOIS, A CORPORATION OF ILLINOIS.

TELEPHONE RECEIVER.

Application filed June 2, 1922.

To all whom it may concern:

Be it known that I, Oscar: M. LEIC'EI, a citizen of the United States,residing at Genoa, in the county of De Kalb and State of Illinois, haveinvented a certain new and useful Improvement in Telephone Receivers, ofwhich the following is a full, clear, concise, and exact description,reference being had to the accompanying drawings, forming a part of thisspecification.

My invention relates to telephone receivers, and more particularly to atelephone receiver provided with a sheet metal cap. Telephone receivershave been frequently made with a metal casing but are generally providedwith a cap for closing the casing, which is made of vulcanite or hardrubber. In certain kinds of telephone work, such as radio work, it isdesirable that the receiver or receivers be made as light as possible,and in order to provide a light receiver I have dispensed with thevulcanite or hard rubber cap, which is comparatively heavy, and haveprovided a cap made of sheet metal, preferably sheet aluminum, whichscrew-thread edly engages the aluminum shell of a receiver, said capbeing provided with an inwardly struck rib which engages with thediaphragm provided in the receiver to clamp the edge thereof against thesupport on the inside of the receiver. The aluminum cap may be dipped insuitable paint which may in itself be an insulator, or if desired, thecap may be provided with a separate insulating covering of comparativelythin rubber. Vhile it is not ordinarily necessary to insulate the cover,yet if this is desired, the

Serial No. 565,406.

this art, and as would fall within the scope of the claims.

In the drawings:

Fig. 1 is a face view of my improved receiver viewed from the cap endthereof;

Fig. 2 is a view in side elevation of the receiver showing the cap incross section, being taken on the line 22 of Fig. 1; and

Fig. 3 is a similar view showing the rubber covering on the cap.

Referring in detail to the drawings, a re ceiver is shown comprising ametal shell 5 which is preferably stamped out of sheet aluminum, andwhich is provided with screw threads at 6 for screw-threadedly receivingthe sheet metal cap 7, said capbeing also preferably made of aluminumand being provided Vith the screw threads at 8 engaging with the screwthreads 6. The cap 7 is provided with a central opening 9 as iscustomary, and is provided with an inwardly struck annular rib 10 whichengages with the diaphragm 11 holding the same against its support 12.By striking the rib 1O inwardly, an exterior annular groove 13 isprovided opposite the rib 10, as the material of the cap is providedwith an outwardly extending fold 14 which merges into the flange 15having the threads 8 thereon. If desired, the cap 7 may be provided witha rubber covering 16 which is provided with a flange portion 17embracing the flange 15, said flange 17 being shaped to conformsubstantially to the contour of the outer surface of the cap 7 adjacentthe flange, and due to the fact that the portion 14 is of larger radiusthan the flange 15, the rubber covering 16 will be held firmly inposition by means of the flange 17 In order to aid in holding the cover16 in position, an enlargement or bead is provided at 18 which isannular, and is adapted to seat in the exterior groove 13 to hold therubber covering in position. The covering 16 is also provided with anenlargement or bead at 19 extending around the opening 20 thereincorresponding to the opening 9 in the cap 7 so as to strengthen orstiffen the material of the rubber covering at said opening.

Having thus described my invention, What I desire to claim and securebyU. S. Letters Patent is: r

1. In a telephone receiver, a metal shell, a metal cap and a rubbercover member for said cap, said cap having a bead thereon around whichsaid cover member extends to hold said cover in position and said covermember having an annular rib thereon adapted to seat in a correspondinggroove in said cap.

2. In a telephone receiver, a metal shell, :1- metal cap and arubbercover member for said cap, said cap and cover having align ing openingsand said cover being thickened at said opening.

In Witness whereof, I hereunto subscribe my name this 12th day of May,A. D., 1922.

OSCAR M. LEICl-l.

